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i i 6 2 l I l KARL KREKELER AND PAUL KRAIS, OF ELBERFELD, GERMANY, ASSIGNORS TO THE FARBENFABRIKEN, VORMALS FR. BAYER & 00., OF SAME PLACE.

BLUE DYE.

PECIFICATION forming part of Letters Patent No. 518,458, dated April 17, 189

- Application filed May Q. 1893. Serial No. 473,593. (Specimena) To all whom it may concern:

Be it known that we, KARL KREKELER and PAUL KRAIS, chemists, doctors of philosophy, and assignors to the FARBENFABRIKEN, VOR- 5 MALS FR. BAYER & 00., of Elberfeld,subjects of the Emperor of Germany, residing at Elberfeld, Prussia, Germany, have invented a new and useful Improvement in the Mannfacture of new Blue Ooloring-lllatter; and We to do hereby declare the following to be a full and exact descriptionof the invention.

Our invention relates to the manufacture of a blue coloring-matter produced by the reaction of the nitroso compound of diethylani- I 5 lin hydrochlorate with gallamic acid.

In carrying out our invention practically we proceed as follows: Ten kilos, by weight, of gallamic acid and fifteen kilos, by weight, of nitrosodiethylanilin hydrochlorate 2 are mixed with ten kilos, by weight, of alcohol and then boiled, until a sample taken out from the reaction mixture dissolves in hot water with a clear blue color. The melt is then poured into one hundred kilos, by weight, of water and five kilos, by weight, of hydrochloric acid of 20 Baum are added. After some time the coloring-matter crystallizes in greenish needles which are filtered OE and dried. The coloring-matter thus obtained has the following formula:

conn,

acid dissolves the dye-stud with blue color, which is changed into red on addlng water; hydrochloric acid (20 Baum) dissolvesitwith red color. The coloring-matter is dlfticultly soluble in hot alcohol, almost insoluble in cold alcohol. The coloring-matter dyes wool mordanted with chromium salts from blue to bluish-violet shades of great clearness, cotton 5 5 mordanted with chromium salts in bluishviolet shades.

We are awarewf the patent to Gelgy, No. 410,733, of Septerhber 10, 1889, and do not claim the body therein described. it is essentially different in its application and dyeing qualities from the body of this application. The dyestulf described by Geigy 1s nearly insoluble in water, and is not capable of dyeing wool. The product of our appllca- 5 tion is easily soluble in water, and can be employed in dyeing without the addition of sodium bisulphite and with other dyestuffs. It can also be used in dyeing wool.

Having thus described our invention, what 7 we claim, and desire to secure by Letters Patent, is

l. The process above described for producing blue coloring-matter by the reaction of nitrosodiethyanilin hydrochlorate and gal- 75 lamic acid in the presence of solvents as for example alcohol or acetic acid.

2. As a new article of manufacture the 001- oring-matter having the formula:

and which is easily soluble in hot Water with a clear blue color, soluble in concentrated sulnames in the presence of two subscribing witphuric acid with the sime color, which color nesses. turns into red on the addition of water, soluble in hydrochloric acid with red color and 5 dyeing wool and cotton mordanted with chromium salts from blue to bluish-violet, sub- Witnesses: stantially as described. WILLIAM ESSENWEIN,

In testimony whereof we have signed our RUDOLPH FRIOKE.

It is hereby certified that in Letters Patent No. 518,458, granted April 17, 1894, upon the application of Karl Krekeler and Paul Krais, of Elberfeld, Germany, for an improveinent in Blue Dyes, an error appears in the printed specification requiring the following correction, viz: In line 75, page 1, the word nitrosodiethyanilin should read nitrosodiethylanilin; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, countersig'ned, and sealed this 24th day of April, A. D. 1894.

JNO. M. REYNOLDS, Assistant Secretary of the Interior.

[SEAL] Oountersigned J OHN S. SEYMOUR,

Commissioner of Patents. 

